Cascade amplifier without back-coupling over the anode potential sources



..Fuiy 9, 193. M. VON ARDENNE WW CASCADE AMPLIFIER WITHOUT BACK COUPLINGOVER THE ANODE POTENTIAL SOURCES Filed March 6, 1953 Patented 'July 9,1935 UNITED STATES PATENT OFFICE CASCADE AMPLIFIER WITHOUT BACK-COU-PLING OVER THE ANODE POTENTIAL SOURCES :Manfred von Ardenne, Berlin,Germany, assignor to Radioaktiengesellschaft D. S. Loewe, Berlin-'Steglitz, Germany, a company of Germany Application March 6, 1933,Serial No. 659,616 Germany March 5, 1932 1 Claim. (01. 179-171) (Grantedunder the provisions of sec. 14, act of March 2, 1927; 357 0. G. 5)

quency, because as regards these slow alternating potentials theblocking condensers of the anode potential sources and the anode controlsteadying system become ineffective. Systems linked up with housecircuits are particularly liable to disturbance, as the inner resistancebetween the mains and the anodes is always a capacitative resistance.

According to the invention, back-coupling is overcome by the fact thatthe first, third and fifth stages and the second, fourth and sixthstages of the valve are operated in common by different anode currentsources. The anode potentials of these stages are in phase, so that again reaction within each group is impossible.

In the drawing a form of embodiment of a four-stage cascade according tothe invention is illustrated by way of example. The anodes of thesystems I and 3 are linked up through the medium of the resistances 5and 6 with the 10 anode current source It], and the anodes of thesystems 2 and '4 through the medium of the resistances 6 and 8 with theanode current source 9.

I claim:

A cascade tube amplifier of three or more stages comprising two anodecurrent sources independent from one another, the anode of the oddstages being connected to the one, the anodes of the even number stagesto the second of said current sources. v

' MANFRED VON ARDENNE.

